ML20207K325

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PNO-77-206:on 771117,licensee Reported Discovery of Throughwall Crack in Reactor Letdown Piping System.Reactor Letdown Sys Switched to Alternate Letdown Path & Normal Path Secured.Licensee Formulating Plans to Repair Crack
ML20207K325
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 11/18/1977
From: Klingler G, Sniezek J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-206, NUDOCS 9903170133
Download: ML20207K325 (1)


Text

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.. "El.I!'11/,T:V NOTir! CATION J(My ' #

n-November 18, 1977 PP,ELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PN i This l 2

areliminary notification constitutes EARLY notice of an event of POSSI3LE safety or_ public interest significance. I The information presented is as initially received without_ verification or evaluation 3

.and is basically all that is known by IE staff on this date.  !

Facility: Portland General Electric Company .

. Trojan Nuclear Power Plant, Rainier, Oregon Docket No. 50-344 ' i T

Subject:

DISCOVERY OF THROUGH-WALL CRACK IN 2-INCH PIPE IN CONTAINMENT BUILDING The licensee reported by telephone the discovery oA November 17,1977. of>

.an approximately piping system. 1/8 inch throughwall crack in the reactor letdown tainment building.The discovery was made'during an entry into the con-The reactor letdown system was switched to an alternate letdown path an the normal letdown path was secured, thus isolating the section of pipe which contains the crack.

The licensee pipe. The Troja is formulating plans to repair the cracked section of the occurrence. n Plant continued to operate at full power throughout There was no relea of the occurrence.se of radioactivity to the environment as a result MM The reactor letdown system is used to. remove'a small*' flow'(approxim 75 gallons per minute) of water from the reactor cooling system to control of the reactor coolant. compensate for water added by pump seal l normal operation is pressurized to approximate The licensee plans to include a discussion of this occurrence in its media each Monday. weekly operating press release which is available 2

N NRC Region V (San Francisco) received initial notification of this fEh3:15p.m.onhovemberoccurrence 17, 1977. by telephone from the Plant Superintendent $ a'

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Contact:

GKlingler, IE x28019 JSniezek, IE x28019 { p y

7 3 Distribution:

eo Transmitted H St'Il6 b /.o Chairman Hendrie d Comissioner Kennedy Com'ssioner Bradford S. J. Chilk, SECY

  • Comissioner Gilinsky C. C. Kamerer, CA n " Transmitted: MNBB (48,0')

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  • L. V. Gossick, EDO PBldgY!O4 (ForDistribution)

E. Volgena E. G. Case, h RR IE S. H. Hanauer, ED0 Region e/l(/

J. J. Fouchard, PA SS Bldg b O .  !

R. Hartfield, MIPC (MAIL)

R. G. Ryan, OSP C. V. Smith, NMSS R. J. McTiernan, 0IA H. K. Shapar, ELD R. Minogue, SD yg PRELIMINARY NOTIFICATION